Dunash ibn Tamim is not known to have undertaken any original astronomical research. However, he did write on the subject, and two of his treatises are extant. His monograph on the armillary sphere survives in a single manuscript in Istanbul (Ayasofya MS 4861). A partial study was published by Stern (1956). Dunash also wrote a commentary on Sefer Yeṣira(The book of creation). Like the rest of his contemporaries, he interpreted laconic and elusive Hebrew treatise as a book on science; consequently, his commentary conveys some basic astronomical knowledge. Dunash’s commentary was widely circulated, both in the original Arabic and in Hebrew translations; hence it may have played no small role in the dissemination of some elementary astronomy within the Jewish communities of the Mediterranean basin.